EYES Flashcards
refers to what a person sees with one eye
visual field
four QUADRANTS OF VISUAL FIELDS
upper temporal,
lower temporal
upper nasal,
lower nasal
occurs as light rays strike the retina, where they are transformed into nerve impulses, conducted to the
brain through the optic nerve, and interpreted.
Visual perception
causes pupils immediately to constrict when exposed to bright light
pupillary light reflex
what is direct and indirect\consensual reflex?
Direct - constriction
Indirect - constriction
what condition where you usually see “spots or floaters”?
common among clients with myopia or in
clients over age 40.
blind spot
scotoma
Seeing halos around lights is associated with
narrow-angle glaucoma.
Night blindness is associated with
optic atrophy, glaucoma, and
vitamin A deficiency.
Double vision
diplopia
is caused by exposure to irritants or
obstruction of the lacrimal apparatus
excessive tearing or EPIPHORA
is often associated with foreign body or obstruction.
UNILATERAL EPIPHORA
is often associated with exposure to irritants, such as makeup or facial cleansers, or it may be a systemic response.
BILATERAL EPIPHORA
what is used to measure pressure within the eye?
tonometry
is the second leading cause of blindness after cataracts. Mayo Clinic (2010b) says it is often referred to as “the
silent thief of sight” because it can damage vision very gradually
with no noticeable loss of vision until the disease is advanced.
Glaucoma
are a clouding of the usually clear lens of the eye, causing a person to see as though looking through a
frosty or foggy window (Mayo Clinic, 2010).
Cataracts
is a major cause of visual impairment that affects the macula portion of the retina
Macular degeneration
is the “second-highest cause
of irreversible blindness in the world.
major cause of visual impairment that affects the macula portion of retina.
Causes deterioration of the macula, central area of the retina
Age-related macular degeneration (AMD)
Used to test distant visual acuity, consists of lines of different letters stacked one above the other. The letters are large at the top and decrease in size from top to bottom.
The client stands
20 feet from the chart and covers
one eye with an opaque card (which
prevents the client from peeking
through the fingers
Snellen Chart
This is used when he client cannot read or has a handicap that prevents verbal communication.
is configured just like
the Snellen chart but the characters
on it are only Es, which face in all
directioN
E CHART
a test for near vision assessed in clients over 40 years of age by holding the pocket screener or newspaper print 14 inches
from the eye. Clients who have decreased accommodation to view
closer print will have to move the card or newspaper further away
to see it.
jaeger test
what is normal distant visual acuity
20/20 with or
without corrective lenses. This means that the client can distinguish what the person
with normal vision can distinguish from 20 feet away
(impaired far vision) is present when the second number in the test result is larger than the first (20/40).
Myopia
A client is considered legally blind when vision in the better eye with corrective lenses is
20/200